1 files changed, 36 insertions, 0 deletions
diff --git a/sway/desktop/fx_renderer/shaders/corner.frag b/sway/desktop/fx_renderer/shaders/corner.frag
new file mode 100644
index 00000000..7699299a
--- /dev/null
+++ b/sway/desktop/fx_renderer/shaders/corner.frag
@@ -0,0 +1,36 @@
+precision mediump float;
+varying vec4 v_color;
+varying vec2 v_texcoord;
+
+uniform bool is_top_left;
+uniform bool is_top_right;
+uniform bool is_bottom_left;
+uniform bool is_bottom_right;
+
+uniform vec2 position;
+uniform float radius;
+uniform vec2 half_size;
+uniform float half_thickness;
+
+float roundedBoxSDF(vec2 center, vec2 size, float radius) {
+    return length(max(abs(center) - size + radius, 0.0)) - radius;
+}
+
+void main() {
+    vec2 center = gl_FragCoord.xy - position - half_size;
+    float distance = roundedBoxSDF(center, half_size - half_thickness, radius + half_thickness);
+    float smoothedAlphaOuter = 1.0 - smoothstep(-1.0, 1.0, distance - half_thickness);
+    // Create an inner circle that isn't as anti-aliased as the outer ring
+    float smoothedAlphaInner = 1.0 - smoothstep(-1.0, 0.5, distance + half_thickness);
+    gl_FragColor = mix(vec4(0), v_color, smoothedAlphaOuter - smoothedAlphaInner);
+
+    if (is_top_left && (center.y > 0.0 || center.x > 0.0)) {
+        discard;
+    } else if (is_top_right && (center.y > 0.0 || center.x < 0.0)) {
+        discard;
+    } else if (is_bottom_left && (center.y < 0.0 || center.x > 0.0)) {
+        discard;
+    } else if (is_bottom_right && (center.y < 0.0 || center.x < 0.0)) {
+        discard;
+    }
+}